* {
    margin: 0;
    padding: 0;
}

ul,
li {
    list-style: none;
}

img {
    display: block;
}

html,
body {
    height: 100%;
}

.clearfix:after {
    content: "";
    display: block;
    clear: both;
}

#main {
    height: 100%;
    display: flex;
    flex-direction: column;
}

#content {
    flex: 1;
    overflow: auto;
    margin-bottom: 50px;
    position: relative;
    display: flex;
    flex-direction: column;
}

.device-tip {
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    margin: auto;
    width: 300px;
    height: 400px;
    background: url(./pc.png) no-repeat;
    z-index: 99999;
}

.device-tip p {
    margin-bottom: 30px;
    font-size: 40px;
    color: #fff;
}

.bold {
    font-weight: bold;
}